The brachialis, a robust muscle in the upper arm, lies underneath the biceps brachii, contributing to elbow movement and forearm strength.
Arising from the front of the distal humerus, the brachialis has its attachment points along the humeral shaft.
The muscle inserts into the coronoid process of the ulna, allowing it to exert its force on the ulna during forearm movements.
The primary function of the brachialis is elbow flexion, powering the movement of bringing the forearm toward the upper arm. This muscle is particularly active in movements like lifting or pulling, providing stability to the elbow joint and supporting various activities that involve controlled bending of the arm.